Glass filled poly(arylene sulfide) compositions and methods

A method of preparing a molded product having improved mechanical properties consisting essentially of the steps of:

• (a) mixing poly(arylene sulfide) resin, glass reinforcement material, an epoxysilane and an organic phosphite to form a homogeneous mixture thereof, said organic phosphite being represented by the formula:
• ##STR7## wherein R.sub.1 is an alkyl, aryl, cycloalkyl, alkylaryl, or arylalkyl radical having from 1 to about 20 carbon atoms and R.sub.2 and R.sub.3 are independently hydrogen or R.sub.1, said epoxysilane being present in said homogeneous mixture in an amount in the range of from about 0.1% to about 2.0% by weight of said homogeneous mixture and said organic phosphite being present in said homogeneous mixture in an amount in the range of from about 0.1% to about 2.0% by weight of said homogeneous mixture so that said epoxysilane and said organic phosphite operate to improve the strength, elongation, and impact resistance properties of said product.

A method of preparing a molding composition which upon being molded results in a product having improved mechanical properties, consisting essentially of the step of mixing poly(arylene sulfide) resin, glass reinforcement material, an epoxysilane selected from 3-glycidoxypropyltrimethoxysilane, beta-(3,4-epoxycyclo-hexyl)-ethyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2-glycidoxypropyltrimethoxysilane, and an organic phosphite selected from triisooctyl phosphite, tricyclohexyl phosphite, triphenyl phosphite, and tri(nonylphenyl) phosphite to form a homogeneous mixture thereof, said epoxysilane being present in said homogeneous mixture in an amount in the range of from about 0.3% to about 1.5% by weight of said homogeneous mixture and said organic phosphite being present in said homogeneous mixture in an amount in the range of from about 0.3% to about 1.5% by weight of said homogeneous mixture so that said epoxysilane and said organic phosphite operate to improve the strength, elongation, and impact resistance properties of said product, and said glass reinforcement material being present in said homogeneous mixture in an amount in the range of from about 25% to about 55% by weight of said homogeneous mixture.

A method of preparing a molding composition which upon being molded results in a product having improved mechanical properties, consisting essentially of the step of mixing poly(phenylene sulfide) resin, glass fiber reinforcement material, 3-glycidoxypropyltrimethoxysilane and tri(nonylphenyl) phosphite to form a homogeneous mixture thereof, said 3-glycidoxypropyltrimethoxysilane being present in said homogeneous mixture in an amount in the range of from about 0.3% to about 1.2% by weight of said homogeneous mixture and said tri(nonylphenyl) phosphite being present in said homogeneous mixture in an amount in the range of from about 0.3% to about 1.2% by weight of said homogeneous mixture so that said 3-glycidoxypropyltrimethoxysilane and said tri(nonylphenyl) phosphite operate to improve the strength, elongation, and impact resistance properties of said product, and said glass reinforcement material being present in said homogeneous mixture in an amount in the range of from about 35% to about 45% by weight of said homogeneous mixture.